Income Taxes (Unaudited) - Reconciliation of Partnership Equity Per Financial Statements to Partners' Equity for Tax Purposes (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation Of Gaap Net Income Loss To Taxable Income Loss [Line Items]
Partners' equity per financial statements	$ 1,310,448	$ 1,333,551	$ 1,374,018	$ 1,413,559
Issue costs of limited partnership units capitalized for tax purposes	579,259
Difference in book vs. tax depreciation	279,610
Partners' equity for tax purposes	$ 2,169,317